#include <metahook.h>
#include "const.h"
#include "crc.h"
#ifdef MAPCRC
#include "bspfile.h"
#endif
#include "common.h"
#include "plugins.h"
#include "console.h"

#define CRC32_INIT_VALUE 0xFFFFFFFF
#define CRC32_XOR_VALUE 0xFFFFFFFF

#define NUM_BYTES 256

const CRC32_t pulCRCTable[NUM_BYTES] =
{
	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
	0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
	0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
	0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
	0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
	0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
	0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
	0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
	0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
	0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
	0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
	0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
	0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
	0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
	0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
	0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
	0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
	0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
	0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
	0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
	0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
	0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
	0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
	0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
	0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
	0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
	0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
	0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
	0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
	0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
	0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
	0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
	0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
	0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
	0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
	0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
	0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
	0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
	0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
	0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
	0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};

void CRC32_Init(CRC32_t *pulCRC)
{
	*pulCRC = CRC32_INIT_VALUE;
}

CRC32_t CRC32_Final(CRC32_t pulCRC)
{
	return pulCRC ^ CRC32_XOR_VALUE;
}

void CRC32_ProcessByte(CRC32_t *pulCRC, unsigned char ch)
{
	CRC32_t ulCrc = *pulCRC;
	ulCrc ^= ch;
	ulCrc = pulCRCTable[(unsigned char)ulCrc] ^ (ulCrc >> 8);
	*pulCRC = ulCrc;
}

void CRC32_ProcessBuffer(CRC32_t *pulCRC, void *pBuffer, int nBuffer)
{
	CRC32_t ulCrc = *pulCRC;
	unsigned char *pb = (unsigned char *)pBuffer;
	unsigned int nFront;
	int nMain;

JustAfew:
	switch (nBuffer)
	{
		case 7:
			ulCrc = pulCRCTable[*pb++ ^ (unsigned char)ulCrc] ^ (ulCrc >> 8);

		case 6:
			ulCrc = pulCRCTable[*pb++ ^ (unsigned char)ulCrc] ^ (ulCrc >> 8);

		case 5:
			ulCrc = pulCRCTable[*pb++ ^ (unsigned char)ulCrc] ^ (ulCrc >> 8);

		case 4:
		{
			ulCrc ^= *(CRC32_t *)pb;
			ulCrc = pulCRCTable[(unsigned char)ulCrc] ^ (ulCrc >> 8);
			ulCrc = pulCRCTable[(unsigned char)ulCrc] ^ (ulCrc >> 8);
			ulCrc = pulCRCTable[(unsigned char)ulCrc] ^ (ulCrc >> 8);
			ulCrc = pulCRCTable[(unsigned char)ulCrc] ^ (ulCrc >> 8);
			*pulCRC = ulCrc;
			return;
		}

		case 3:
			ulCrc = pulCRCTable[*pb++ ^ (unsigned char)ulCrc] ^ (ulCrc >> 8);

		case 2:
			ulCrc = pulCRCTable[*pb++ ^ (unsigned char)ulCrc] ^ (ulCrc >> 8);

		case 1:
			ulCrc = pulCRCTable[*pb++ ^ (unsigned char)ulCrc] ^ (ulCrc >> 8);

		case 0:
		{
			*pulCRC = ulCrc;
			return;
		}
	}

	nFront = ((unsigned int)pb) & 3;
	nBuffer -= nFront;

	switch (nFront)
	{
		case 3:
			ulCrc = pulCRCTable[*pb++ ^ (unsigned char)ulCrc] ^ (ulCrc >> 8);
		case 2:
			ulCrc = pulCRCTable[*pb++ ^ (unsigned char)ulCrc] ^ (ulCrc >> 8);
		case 1:
			ulCrc = pulCRCTable[*pb++ ^ (unsigned char)ulCrc] ^ (ulCrc >> 8);
	}

	nMain = nBuffer >> 3;

	while (nMain--)
	{
		ulCrc ^= *(CRC32_t *)pb;
		ulCrc = pulCRCTable[(unsigned char)ulCrc] ^ (ulCrc >> 8);
		ulCrc = pulCRCTable[(unsigned char)ulCrc] ^ (ulCrc >> 8);
		ulCrc = pulCRCTable[(unsigned char)ulCrc] ^ (ulCrc >> 8);
		ulCrc = pulCRCTable[(unsigned char)ulCrc] ^ (ulCrc >> 8);
		ulCrc ^= *(CRC32_t *)(pb + 4);
		ulCrc = pulCRCTable[(unsigned char)ulCrc] ^ (ulCrc >> 8);
		ulCrc = pulCRCTable[(unsigned char)ulCrc] ^ (ulCrc >> 8);
		ulCrc = pulCRCTable[(unsigned char)ulCrc] ^ (ulCrc >> 8);
		ulCrc = pulCRCTable[(unsigned char)ulCrc] ^ (ulCrc >> 8);
		pb += 8;
	}

	nBuffer &= 7;
	goto JustAfew;
}

unsigned char COM_BlockSequenceCRCByte(unsigned char *base, int length, int sequence)
{
	CRC32_t crc;
	byte *p;
	byte chkb[60 + 4];

	if (sequence < 0)
		Con_DPrintf("sequence < 0, in COM_BlockSequenceCRCByte\n");

	p = (byte *)pulCRCTable + (sequence % (sizeof(pulCRCTable) - 4));

	if (length > 60)
		length = 60;

	memcpy(chkb, base, length);

	chkb[length] = p[0];
	chkb[length + 1] = p[1];
	chkb[length + 2] = p[2];
	chkb[length + 3] = p[3];
	length += 4;

	CRC32_Init(&crc);
	CRC32_ProcessBuffer(&crc, chkb, length);
	return (unsigned char)CRC32_Final(crc);
}

int CRC_File(CRC32_t *crcvalue, char *pszFileName)
{
	FileHandle_t fp;
	byte chunk[1024];
	int nBytesRead;
	int nSize;

	fp = g_pFileSystem->Open(pszFileName, "rb");
	nSize = g_pFileSystem->Size(fp);

	if (!fp || (nSize == -1))
		return 0;

	while (nSize > 0)
	{
		if (nSize > 1024)
			nBytesRead = g_pFileSystem->Read(chunk, 1024, fp);
		else
			nBytesRead = g_pFileSystem->Read(chunk, nSize, fp);

		if (nBytesRead > 0)
		{
			nSize -= nBytesRead;
			CRC32_ProcessBuffer(crcvalue, chunk, nBytesRead);
		}

		if (g_pFileSystem->IsOk(fp))
		{
			g_pFileSystem->Close(fp);
			fp = NULL;
			break;
		}
	}

	if (fp)
		g_pFileSystem->Close(fp);

	return 1;
}

#ifdef MAPCRC
int CRC_MapFile(CRC32_t *crcvalue, char *pszFileName)
{
	FILE *fp;
	byte chunk[1024];
	int i, l;
	int nBytesRead;
	dheader_t header;
	int nSize;
	lump_t *curLump;
	long startOfs;
	int nLumpID;

	nLumpID = LUMP_ENTITIES;

	if (!stricmp(com_gamedir, "bshift"))
		nLumpID = LUMP_PLANES;

	nSize = COM_FOpenFile(pszFileName, &fp);

	if (!fp || (nSize == -1))
		return 0;

	startOfs = ftell(fp);

	if (fread(&header, sizeof(header), 1, fp) != 1)
	{
		Con_Printf("Could not read BSP header for map [%s].\n", pszFileName);
		fclose(fp);
		return 0;
	}

	i = LittleLong(header.version);

	if (i != Q1BSPVERSION && i != BSPVERSION)
	{
		fclose(fp);
		Con_Printf("Map [%s] has incorrect BSP version (%i should be %i).\n", pszFileName, i, BSPVERSION);
		return 0;
	}

	for (l = 0; l < HEADER_LUMPS; l++)
	{
		if (l == nLumpID)
			continue;

		curLump = &header.lumps[l];
		nSize = curLump->filelen;
		fseek(fp, startOfs + curLump->fileofs, SEEK_SET);

		while (nSize > 0)
		{
			if (nSize > 1024)
				nBytesRead = fread(chunk, 1, 1024, fp);
			else
				nBytesRead = fread(chunk, 1, nSize, fp);

			if (nBytesRead > 0)
			{
				nSize -= nBytesRead;
				CRC32_ProcessBuffer(crcvalue, chunk, nBytesRead);
			}

			if (ferror(fp))
			{
				if (fp)
					fclose(fp);

				return 0;
			}
		}
	}

	if (fp)
		fclose(fp);

	return 1;
}
#endif

void MD5Transform(unsigned int buf[4], unsigned int const in[16]);

void MD5Init(MD5Context_t *ctx)
{
	ctx->buf[0] = 0x67452301;
	ctx->buf[1] = 0xefcdab89;
	ctx->buf[2] = 0x98badcfe;
	ctx->buf[3] = 0x10325476;

	ctx->bits[0] = 0;
	ctx->bits[1] = 0;
}

void MD5Update(MD5Context_t *ctx, unsigned char const *buf, unsigned int len)
{
	unsigned int t;

	t = ctx->bits[0];

	if ((ctx->bits[0] = t + ((unsigned int) len << 3)) < t)
		ctx->bits[1]++;

	ctx->bits[1] += len >> 29;
	t = (t >> 3) & 0x3f;

	if (t)
	{
		unsigned char *p = (unsigned char *)ctx->in + t;

		t = 64 - t;

		if (len < t)
		{
			memcpy(p, buf, len);
			return;
		}

		memcpy(p, buf, t);

		MD5Transform(ctx->buf, (unsigned int *)ctx->in);
		buf += t;
		len -= t;
	}

	while (len >= 64)
	{
		memcpy(ctx->in, buf, 64);
		MD5Transform(ctx->buf, (unsigned int *)ctx->in);

		buf += 64;
		len -= 64;
	}

	memcpy(ctx->in, buf, len);
}

void MD5Final(unsigned char digest[16], MD5Context_t *ctx)
{
	unsigned count;
	unsigned char *p;

	count = (ctx->bits[0] >> 3) & 0x3F;

	p = ctx->in + count;
	*p++ = 0x80;
	count = 64 - 1 - count;

	if (count < 8)
	{
		memset(p, 0, count);
		MD5Transform(ctx->buf, (unsigned int *)ctx->in);

		memset(ctx->in, 0, 56);
	}
	else
		memset(p, 0, count - 8);

	((unsigned int *)ctx->in)[14] = ctx->bits[0];
	((unsigned int *)ctx->in)[15] = ctx->bits[1];

	MD5Transform(ctx->buf, (unsigned int *)ctx->in);

	memcpy(digest, ctx->buf, 16);
	memset(ctx, 0, sizeof(ctx));
}

#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))

#define MD5STEP(f, w, x, y, z, data, s) \
	(w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x)

void MD5Transform(unsigned int buf[4], unsigned int const in[16])
{
	register unsigned int a, b, c, d;

	a = buf[0];
	b = buf[1];
	c = buf[2];
	d = buf[3];

	MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
	MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
	MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
	MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
	MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
	MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
	MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
	MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
	MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
	MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
	MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
	MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
	MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
	MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
	MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
	MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);

	MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
	MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
	MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
	MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
	MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
	MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
	MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
	MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
	MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
	MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
	MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
	MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
	MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
	MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
	MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
	MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);

	MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
	MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
	MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
	MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
	MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
	MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
	MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
	MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
	MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
	MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
	MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
	MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
	MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
	MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
	MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
	MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);

	MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
	MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
	MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
	MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
	MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
	MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
	MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
	MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
	MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
	MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
	MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
	MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
	MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
	MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
	MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
	MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);

	buf[0] += a;
	buf[1] += b;
	buf[2] += c;
	buf[3] += d;
}

int MD5_Hash_File(unsigned __int8 *digest, char *pszFileName, int bUsefopen, int bSeed, unsigned int *seed)
{
	FileHandle_t fp;
	FILE *fp2;
	byte chunk[1024];
	unsigned int nBytesRead;
	unsigned int nSize;
	MD5Context_t ctx;

	if (bUsefopen)
	{
		fp2 = fopen(pszFileName, "rb");

		if (!fp2)
			return 0;

		fseek(fp2, 0, SEEK_END);
		nSize = ftell(fp2);
		fseek(fp2, 0, SEEK_SET);

		if (nSize <= 0)
		{
			fclose(fp2);
			return 0;
		}
	}
	else
	{
		fp = g_pFileSystem->Open(pszFileName, "rb");

		if (!fp)
			return 0;

		nSize = g_pFileSystem->Size(fp);

		if (nSize <= 0)
		{
			g_pFileSystem->Close(fp);
			return 0;
		}
	}

	memset(&ctx, 0, sizeof(ctx));
	MD5Init(&ctx);

	if (bSeed)
		MD5Update(&ctx, (const unsigned char *)&seed[0], 16);

	if (bUsefopen)
	{
		while (nSize > 0)
		{
			if (nSize > 1024)
				nBytesRead = (unsigned int)fread(chunk, 1, 1024, fp2);
			else
				nBytesRead = (unsigned int)fread(chunk, 1, nSize, fp2);

			if (nBytesRead > 0)
			{
				nSize -= nBytesRead;
				MD5Update(&ctx, chunk, nBytesRead);
			}

			if (feof(fp2))
			{
				fclose(fp2);
				fp2 = NULL;
				break;
			}
			else if (ferror(fp2))
			{
				if (fp2)
					fclose(fp2);

				return 0;
			}
		}

		if (fp2)
			fclose(fp2);
	}
	else
	{
		while (nSize > 0)
		{
			if (nSize > 1024)
				nBytesRead = g_pFileSystem->Read(chunk, 1024, fp);
			else
				nBytesRead = g_pFileSystem->Read(chunk, nSize, fp);

			if (nBytesRead > 0)
			{
				nSize -= nBytesRead;
				MD5Update(&ctx, chunk, nBytesRead);
			}

			if (g_pFileSystem->IsOk(fp))
			{
				g_pFileSystem->Close(fp);
				fp = NULL;
				break;
			}
#if 0
			else if (ferror(fp))
			{
				if (fp)
					fclose(fp);

				return 0;
			}
#endif
		}

		if (fp)
			g_pFileSystem->Close(fp);
	}

	MD5Final(digest, &ctx);
	return 1;
}

char *MD5_Print(unsigned char hash[16])
{
	static char szReturn[64];
	unsigned char c;
	char szChunk[10];
	int i;

	memset(szReturn, 0, 64);

	for (i = 0; i < 16; i++)
	{
		c = (unsigned char)hash[i];
		sprintf(szChunk, "%02x", c);
		strcat(szReturn, szChunk);
	}

	return szReturn;
}